JPS5840585Y2 - Koushi Yuha Coil - Google Patents

Description

[Detailed description of the invention] The present invention relates to high-frequency coils commonly used in radios, televisions, etc. The movable magnetic core, which is built in for the purpose of tuning to a required frequency, is connected to multiple strip-shaped parts formed in a part of a shielding case. It is supported by a threaded section provided to obtain stable rotating torque of the movable magnetic core against variations in eccentricity and outer diameter dimensions of the movable magnetic core, and at the same time improves mechanical performance such as vibration resistance and impact resistance. .

Conventionally, in this type of high-frequency coil, the movable magnetic core is supported by a threaded part provided in a part of the shield case, which saves parts supporting the movable magnetic core and improves environmental characteristics such as heat resistance and moisture resistance. Efforts are being made to gain credibility.

FIG. 1a is a perspective view of a conventional high-frequency coil, in which 1 is a shield case, 2 is a movable magnetic core, 3 is a notch, 4 is a threaded portion, and 5 is a band-shaped portion.

The threaded portion 4 is formed by pressing into a strip-shaped portion 5 shaped by two longitudinal cuts 3.

The same effect can be seen on the opposing sides as well.

The movable magnetic core 2 is held inside the shield case 1 by a screw portion provided on the movable magnetic core 2 fitting into a screw portion 4 of the shield case.

However, in the conventional high-frequency coil configured in this manner, support becomes unstable due to eccentricity of the movable magnetic core and variations in outer diameter dimension that often occur during production, making it difficult to obtain stable rotational torque.

That is, if the outer diameter of the movable magnetic core 2 is small, it will be supported at two points by the threaded portion 4 as shown in Figure 1, and if it is large, it will be supported at four points as shown in Figure C. This is because if it is eccentric, it tends to be supported at three points as shown in Figure d.

The present invention eliminates these drawbacks and provides stable rotating torque of the movable magnetic core even with variations in the eccentricity and outer diameter of the movable magnetic core, and at the same time improves mechanical performance such as vibration resistance and impact resistance. The present invention is a high-frequency coil with improved performance, and will be described below with reference to FIG. 2, which is an embodiment thereof.

Fig. 2a, which shows the high-frequency coil of the present invention, is compared with Fig. 1, which shows the conventional high-frequency coil.
The shield case 1, the notch 3, and the movable magnetic core 2 are all the same, but another notch 8 is provided approximately in the center of the portion corresponding to the band-shaped portion 5 in FIG. It's a formality.

The two strip portions 6 and 7 are provided with threaded portions 9 and 9□, respectively, which fit into the screws of the movable magnetic core 2.

The length of each circular arc formed by the threaded portions 9□, 9□ is shorter than the length of the circular arc formed by the conventional threaded portion 4.

By providing the notch 8, the portion 49 of the threaded portions 90, 92 forming the notch 3 is formed by a force that tries to spread out the center of the circular arc formed by the threaded portion 4, as shown in FIG. It is bent further inside the shield case 1 than before it was provided.

This also applies to portions C and 2 of the threaded portions on the opposing surfaces that also form the notches 3.

On the other hand, the portions E, F, T, and C forming the notch 8 are bent toward the outside of the shield case than before.

In the high-frequency coil of the present invention configured as described above, the movable magnetic core 2 is formed in a portion where the notch 3 of the threaded portion is formed.

It is supported by the four points of opening, c, and 2, and by shortening the length of the arc formed by the threaded part by the notch 8, the band-shaped parts 6 and 7 have increased flexibility and can be deformed independently. Therefore, even if there is variation in the outer diameter of the movable magnetic core 2, it can be elastically accommodated over a wide range along the outer diameter.

Therefore, even if the outer diameter of the movable magnetic pole core 2 varies, stable four-point support is always obtained without changing the position or number of support points as in the conventional case, so rotational torque is stable and vibration resistance is achieved at the same time. , mechanical performance such as impact resistance is also improved.

In particular, the so-called initial cutting torque stabilizes quickly when the movable magnetic core is screwed into the shield case.

Since the band-shaped portion is divided, the elastic return of the end of the band-shaped portion after molding the shield case is small, and the variation thereof is also reduced, resulting in extremely high molding accuracy.

In the embodiment of the present invention, two strip-shaped portions are provided on one surface, but if it is necessary to increase the number of support points for the movable magnetic core, the number of cuts and the number of strip-shaped portions may be increased.

For example, if three strips are provided by two cuts,
It is also possible to support the movable magnetic core at the center of the middle normal part to provide six-point support.

Also, at this time, it is not necessarily necessary to provide threaded portions on all of the plurality of strips provided on one surface, and if the purpose is simply to provide freedom in the movement of the support point, the strips may be used. does not require a threaded part.

In short, the present invention has the practical effect of stably supporting the movable magnetic core using four or more supporting points.

[Brief explanation of drawings]

Figure 1a is a perspective view of a conventional high-frequency coil;
d is an explanatory diagram showing a state in which the movable magnetic core of a conventional high-frequency coil is supported by a threaded portion, FIG. 2a is a perspective view of the high-frequency coil of the present invention, and FIG. FIG. 1...Shield case, 2...Movable magnetic core, 3...Notch, 4...Threaded part of conventional high frequency coil, 5...・Strip-shaped portion of the conventional high-frequency coil, 6, 7... Strip-shaped portion of the high-frequency coil of the present invention, 8... Cuts provided in the high-frequency coil of the present invention, 9, 9... ... Threaded part of the high frequency coil of the present invention, A99, B, H2... Threaded part forming notch 3, E, H, T, CH... Forming notch 8 screw part.

Claims (1)

[Scope of utility model registration request] On at least two opposing sides of the square shield case,
A movable magnetic core for tuning frequency adjustment, which has a plurality of strip-shaped parts each divided by a vertical cut, and further has screws that fit with the threads by forming screws in at least two of the strip-shaped parts. A high-frequency coil that can hold .